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This is a fully assembled BCM lower receiver that gives your AR-15 build a serious head start. Bravo Company machines the receiver from a 7075-T6 aluminum forging and finishes it with a hardcoat anodizing per MIL-A-8625F Type III Class 2, so you get the corrosion resistance and wear protection that holds up to real range time and hard use. Fire controls are marked SAFE and SEMI, and it ships with a staked M4 lock nut, BCM enhanced trigger guard, and the BCM Gunfighter grip. This is a cosmetic blem unit, which means minor external finish marks from the factory while the function and mechanical tolerances stay exactly where BCM sets them.
The heart of this lower is BCM's patented MK2 Recoil Mitigation System. Instead of a standard carbine setup, it uses a longer 8-position intermediate receiver extension paired with an M16A4 rifle-length action spring. That extra spring length spreads the load across more coils and widens the operating envelope, which makes the rifle less picky about ammo, cleaning intervals, and different gas system lengths. The result is more consistent carrier velocity, reduced bolt bounce, and a smoother impulse that helps you track your dot or reticle through the shot for faster follow-ups. The 7075-T6 aluminum buffer is hardcoat anodized to match the receiver for lasting durability.
The Mod 1 SOPMOD widebody stock gives you a more pronounced cheek weld than slimmer options, plus a snag-free profile with no sharp edges to catch on a sling or gear. There's a storage compartment tucked in the toe of the stock, ambidextrous QD sling sockets, and the modular VBOST tab for securing your sling when the rifle is slung. Inside, the BCM PNT trigger runs a polished nickel-Teflon finish for a clean, consistent pull. Pair it with any mil-spec upper and you've got a proven foundation ready to run right out of the box.
A cosmetic blem means the receiver left the factory with minor external finish marks like light scuffs or small anodizing irregularities. The function, tolerances, and mechanical quality are identical to a first-quality BCM lower. Most people find the marks disappear once the lower is built into a complete rifle.
The MK2 RMS uses a longer 8-position receiver extension with an M16A4 rifle-length action spring instead of a standard carbine setup. This keeps carrier velocity more consistent, reduces bolt bounce, and softens felt recoil for faster, flatter follow-up shots. It also widens the operating envelope, making the rifle more forgiving with different ammo and gas system lengths.
Yes, this is a mil-spec dimension lower that mates up with any standard AR-15 upper receiver. It ships fully assembled with the trigger, buffer system, and Mod 1 SOPMOD stock installed, so you just pin on your upper of choice and you're ready to run. Note the MK2's longer extension means some mil-spec stocks won't collapse fully closed, but the included Mod 1 SOPMOD is matched to it.
The lower comes complete with the trigger, grip, buffer system, and stock, so the only thing you need is an upper receiver assembly to build a complete rifle. Everything is torqued and ready to function out of the box. It's a strong foundation whether you're building for range days, competition, or general use.
| UPC | 812526024350 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BCMLRG-RMS-STK-MOD-1-SPMD-BLK-COSMO |
| Action | |
| Caliber/Gauge | Multi |
| Color | Black |
| Model | |
| Product Type | Complete Lower Receiver |
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